Airman 1st Class Kristen Lowder, a medical laboratory technician assigned to the 28th Medical Support Squadron, places a blood sample into a centrifuge at Ellsworth Air Force Base, S.D., Nov. 7, 2016. A centrifuge is a laboratory device that is used to separate fluids, gas or liquid, based on density, and is achieved by spinning a vessel containing the material at high speed. (U.S. Air Force photo by Airman 1st Class Denise M. Jenson)